Horses playground

The fence for the horses has the shape of a rectangular trapezoid with an area of 400 m2, the base lengths should be 31 m and 19 m. How many meters of boards will they need to fence it if the boards are stacked in 5 rows?

Correct result:

x =  430 m


S=400 m2 a=31 m c=19 m n=5  S=a+c2 d  d=2 Sa+c=2 40031+19=16 m  b=d2+(ac)2=162+(3119)2=20 m  o=a+b+c+d=31+20+19+16=86 m  x=n o=5 86=430 m

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